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P a g e
4.5.3 General Rules for CAN Jumpers
If connectivity is to the vehicle CAN FMS “firewall” then both jumpers are normally in as shown in
Figure 3. Some FMS gateways requires an “acknowledgement” message on the hardware layer in
order to send any messages and therefore the FM must b
e in the “read/write” mode. Check that the
resistance is 60 Ohms after connecting the FM unit and then remove the “Termination Jumper” if
necessary as shown in Figure 4. Sometimes a terminating resistor or other telematics equipment may
already have a terminating 120 Ohm resistor fitted; in this case the terminating resistor can be
removed and the “read/write” resistor can be left in as shown in Figure 4
.
If there is no FMS “firewall” fitted, then connectivity will be to the vehicle CAN “hot side” –
only with
customer’s permission
– then both jumpers must be removed as shown in Figure 1. Prior to
commencing the installation, check that the vehicle CAN resistance is 60 Ohms, if it is not, e.g. 40
Ohms or 120 Ohms, inform the customer as this should be corrected prior to commencing the
installation. If a reading of 40 Ohms is present, prior to connecting the FM unit, this could indicate that
another telematics system may already be present with a terminating 120 Ohm resistor fitted and this
will distort the CAN resistance reading and may cause CAN errors to be seen.
4.6 Inserting of SIM card
In order to insert the SIM card, the following steps must be followed:
Observe ESD precautions as prescribed in section 3.1.4
Remove the front panel
The SIM card holder is located under the pc board
If required the pc board can be slid out of the housing to access the SIM card holder
Insert the SIM card as indicated below
4.7 Beep and flash codes
4.7.1 Code Plug Socket LED flash codes
Upon the insertion of a CAN Diagnostic Plug the FM 3617i/FM 3717i/FM 3817i will beep and flash the LED on
the code plug socket, in accordance with the table below, to provide diagnostic information:
Condition
Beep and Flash Code
Durations
CAN Functionality Detected by OBC
No Beeps
1second on, 1second off
CAN Communications Detected by OBC
1 double beep per second
1second on 1second off